Demand for better fuel economy and performance has choked off sales over the years. The Crown Victoria and Town Car get just 24 miles per gallon on the highway, a figure matched by some large three-row SUVs today. Most cars today are built with so-called unibody engineering in which the body sides and roof play a role in keeping the body rigid. Crown Victorias were engineered with an old-fashioned body-on-frame design that's mostly used by pickup trucks today because, while heavier, it's better able to bounce back from heavy, punishing use. For some buyers there's no obvious replacement for these rugged cars.